Stapling machine



Mmm u 1924., www@ J. B. cRoFooT STAPLING MACHINE.

Filed oct; 27. 1922 k2 shams-sheet 1 Mwah M 1924i@ I lf@ J. B. cRoFooTSTAPLING MACHINE Filed Oct. 27 1922 2 Sheets-Shea?. 2

Patented ilil, ilfll.

UNHT@ @FATES JOEE B. CROFOOT, OF CHCAGQ, ELLINGIL'S.

Application filed October 27, 1922. erial No. 597,358.

To4 all whom t may concern.'

Be it known that I, JOHN B. Cnoroo'r, a citizen of the United States,residing at Chicago, in the county of Cook and State of lllinois, haveinvented certain new and useful improvements in Stapling Machines; and ldo hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same, reference being hadto the accompanying drawings, and to the letters and figures ofreference marked thereon, which form a part of this specification.

'llhis invention relates to stapling machines and has for an object toprovide a staphng machine which will set the last staple of stripwithout jamming the machine.

Afurther object of my invention is to provide a stapling machine with afeed pawl adapted" to engage openings in the backs of the staple stripand with a holding pawl adapted to openings in the necks of the staplestrip.. p

With these and other objects in vie'w the invention comprises certainnovel parts, units, elements, combinations, arrangements and functions,as disclosed in the drawings, together with mechanical and functionalequivalents thereof, as will be hereinafter more fully described andclaimed.

lln the drawings:

Figure 1 is a view partlyvin side elevation and partly in verticallongitudinal section through a machine embodying the present invention,the staple strip being shown at aflvanced or forwardly fed position;

-Figure 2 is a view taken on the same plane as Figure 1 with a stapleunit shown in detached and set position and the feeding means drawn backfor feeding the strip;

Figure 3 is a horizontal sectional viewr taken on line 3`3 of Figure 2;

Figure 4 is a vertical sectional view taken on line 4 4: of Figure 2showing the feed and hold-back in end elevation and a staple K in setposition;

` `lEigure 5 is a perspective view of the feed and hold-back in ie oftheir relative positions but detached from the other or supportingstructures;

Figure 6 is a perspective view pf a single staple unit detached from the.strip showing one ofthe many forms in which the staple including theperforations may be made and of the design shown in elevation at Figure3;

Figures 8 and 9 are views in elevation of the back of staple strips eachembodying slight variations in design but each adapted to be operatedwith the machine of the pres-- ent invention.

Like characters of reference indicate corresponding parts throughout theseveral views.

As shown in the drawings the stapling machine is designed as a machinefor inserting staples into boxes or other bodies or objects asdistinguished from employing the staples for fastening together papersor the like, but s uch showing is not intended as in any way limitingthe present invention as the feeding. .mechanism is as applicable to amachine for fastening together papers or the like as a specific type ofmachine disclosed, and the machine shown as it is is only illustrativeof a machine for employing the present invention. The machine ofwhatever type and for whatever purpose will, and as it ordinarily does,employ a plunger 10 which is normally held yieldingly upward by a spring11 and is depressed by a blow of the hand upon the head 12. The machinealso employs a knife 13 serving also as a guide for the staple strip,all in substantially theulsual and well-known manner. No novelty for thefeatures just mentioned or described is claimed in the present instanceand it is the intention of the present invention to employ any usual andordinary machine of the type now known or hereinafter originated for thepurpose. rlhe machine will also employ a sliding bolt 14 controlled by aspring 15, the plunger 10 having a cam surface 16 operating against anincline 17 on a sliding bolt so that as the plunger 10 reciprocates inthe well-known manner, the sliding bolt also reciprocates. 'llhe slidingbolt carries a feed indicated as an entirety at 18. This feed member ispivoted to the` bolt 14 at 19 as is the common practicein the art andemploys a spring 2O for the purpose of holding the feeding extremity ofthe feed in proper operative engagement with the staple strip to behereinafter more fully described. A hold-back member or detent 21 isalso pivoted at 22 controlled by a spring 23, as is also common in theart..

The present invention resides in the modiication of these feeding andhold-back mem-Y in conjunction vunits and upon opposite si bers byproviding the feed member with two `feeding points 24 and the hold-backor detent with a single point 25. To operate with the hold-back having asingle point 25 a staple strip is necessary having openings 26intermediate the staple units, as shown more particularly at Figure 3which discloses a'v top plan view of the staples as they may be lookeddown upon resting upon the guide knife 13. These peryforations oropenlngs 26 are formed in that section of the staple strip intermediatethe units so that the severing ofthe units is brought about by thesevering of the two attenuated connecting stri s between the es of saidperforation 26. The appearance of these severed stri s is indicated at27 in Figure 6. Also in t e back of the unit itself an opening oropenings are 'provided in the type shown at 28. These openings 28 areprop- `irly spaced to be engaged by the points 24 ofthe feed, therelation of the feed and holdback being such that the feed points 24enage in the opening 28 whereas the point 25 of the hold-back engages inthe perforation 26. The result of this arrangement of the perforationsin the units and strip and the co-action of the specific type of feedand hold-back is such that the strip is moved forward so that, asindicated at Figure 1 the very over the end of the knife and intoposition to be. engaged by the descending an which eliminates thejamming c ogglng of the device resulting from the improper Y' placing ofthe last one or two units in the strip and enables the user not only touse all of the staples i effect an economy but also prevents vexationand annoyance resulting from the jamming and clogging of the device bythe improper implacement of the last one or two units in operativeposition. While the staples shown at Figures2, 3 and 6 are found to behighly eicient and well adapted for the purpose 1t is obvious that theconstruction of the perforations circular as therein shown is immaterialand such perforations may be made elongated as shown at 29 and 30in'Figure 7, or by making the perforations in other shapes, as indicatedat 31 and 32 in Figure 9. Also it is obvious that thespacedlperforations in the back of the units as shown at Figures 6, 7and 9 are immaterial to the present invention as the perforations mayobviously be connected to 'form an elongated slot as shown at 33 atFigure 8 and this irrespective of the shape or relation of the .openingintermediate the units as shown at 34 in that figure. i

.While a number of different forms, types and 'designs of staples havebeen and are shown in the drawings, each adapted for operation with themachine and the improved last unit in the strip may be moved.

lunger in the strip and thereby' parts of the machine hereinbeforedescribed, it is to be understood that the use of the said machine ormachine parts is not in any way` limited by the showingy of the staplesin the drawings and would include the use of any kind or design ofstaples adapted for coaction with said improved feed and holdback parts.

What I claim is:l

1. A stapling machine comprising a frame, a plunger therein` a staplestrip support adapted to receive a staple strip composed of a pluralityof staple units connected by integral connecting portions and providedwith perforations in the backs of vthe'staple units, and a bifurcatedpawl in said frame having spaced unit-engaging points so mounted on theframe as to engage the -perforations in the backs of said staple unitsand to feed the same to the plunger.

2. A stapling machine comprisinga frame, a plungern therein, a staplestrip support comprising a knife-edge adapted to receive a staple stripcomposed of a plurality of staple units connected by integral connectingportions and provided with perforations in the backs of the staples,anda bifurcated pawl in the frame having staple unit engaging points somounted on the frame as to engage the perforations in the backs of saidstaple units and feed plunger, and adaptedv in its feeding movement tobe projected beylond said knife edge.

3. A stapling mac ine comprising a frame, a plunger therein, a staplestrip support comprising a knife edge adapted to receive a staple stripcomposed of a plurality of staple units necting portions and providedwith perforations in the backs of the staples, aibifurcated pawl in theframe'having staple unit engaging points so mounted on the frame as toengage the perforations in the backs of said staple'units and feed thesame to the plunger, adapted in its feeding movement to be projectedbeyond said edge, and a detent proportioned' to engage between the unitsand prevent retroactive movement.

4. A stapling machine comprising a. frame, a plunger therein, a staplestrip support adapted to receive a staple strip composed of a pluralityof staple units connected by integral connecting portions and providedwith perforations in the backs of the staple'units, a yspring-pressedbolt reciprocated by the plunger, and a bifurcated pawl carried by thebolt and having spaced unit engaging points so mounted as to engage theperforations in the backs of said vstaple unit and feed the same to theplunger.

`5. A stapling frame, a plunger therein, a staplestrip support adaptedto receive a staple strip composed of a plurality ofstaple unitsconnected vintegral connecting potions and pre1 the same to theY machinecomprlsmg a.

connected by integral con-` .cated by the ineens@ vided withperforations in the backs of the staple units, a spring-pressed boltreciprolunger, a, bifurcated pawl carried by the olt and having spadunit engaging points so mounted as to engage the perforatlons in thebacks of said staple unit and feed the same to the plunger, and a detentproportioned to engage between the units and prevent retroactivemovement,

6. A stapling machine comprising a frame, a plunger therein, a staplestrip support comprising a knife edge and adapted to receive a staplestrip composed of a plurality of staple units connected by integralconnecting portions and provided with perfora-E tions inY the backs ofthe staple units, a spring-pressed bolt reciprocated b the plunger, anda bifurcated pawl carried by said bolt having spaced unit engagingpoints so mounted on the frame as to engage the perforations in thebacks of said staple units and.` feed the same to the plunger, and

adapted in its feeding movement to be projected beyond said knife edge.

7. A stapling machine comprising e frame, a plunger therein, a staple,strip support comprising a knife edge adapted to re ceive a staple stripcomposed of a plurality of staple units connected by integral oonnectingportions and provided with perforations in the backs of theI stapleunits, a spring-pressed bolt reciprocated by the plunger, a bifurcatedpawl carried by said bolt having spaced unit engaging points so mountedon the frame as to engage the perforations in the backs of said stapleunits and feed the same to the plunger, and adapted in its feedingmovement to be projected beyond said knife edge, and a. detentproportioned to engage between the umts and prevent retroactivemovement.

In testimony whereof I hereunto ax my signature.

JOHN B. CROFOOT.

